This morning, one of my students taught me this word in Latin class.  I had never heard it before.  

We were talking about English words that come from the Latin word postulare (to demand or ask). 

From the Latin postulare (to demand, or ask), English derives postulate.  As a verb, to postulate is to ask, assert, or demand something.  As a noun, a posulate is the demand, or claim itself. 

The student asked if the word postulant was related to this word.  Since I had never encountered the word before, I had to ask what a postulant was,

A postulant is someone requesting admission.  Usually, the postulant is seeking admission into a religious order.